Cable clamp



Jan. 30, 1945. H. 4.1. ROLLAND CABLE CLAMP- Filed Nov. 25

INVENTOR HJRoLLAN www /17 v5: ATTOR NET Patentecl Jan. 30, .1945

n Herman' J Rolland, Montreal; Quebec, {Banania} "L f l-munitatien Novemben z5, ma seiai naamw solaires. (o1. 24:7135'),

This invention 'relates to cableI clamps and .tlie'v object is f to provide a; generallyimproved' clamp of the:type.;.eomprising a clamping.,platev and aA cooperating-x U -shaped` clamping bolt having its plate and.E equippedfwithfrclamping nuts.

type of cable clamp the clampingr plate is usually f provided with cable-engaging lugs lyingat opposite sides of that portion of the clamp-ing 'plate against which the cable elements'are clamped by the bight portion of the clamping bolt. When the clamping nuts are .tightened `the cable elements are spread or expanded laterallyagainstthe lugs lying at opposite sides thereof. f One' improvement afforded by the. present in with inclined surfaces against which the clamping nuts are tightenedy the location and inclination of said surfaces being such that the pressure of the clamping nuts tends to force opposing lugs lying at opposite sides of the cable elements toward each other and thus into closer 'gripping -engagement with the interposedI cable elements. In other words, the clamping nuts serve, when tightened against said inclined surfaces, to subject opposing cable-engaging lugs to inward pressure in direct opposition to the outward pressure exerted against said lugs by the interposed cable elements whenthe latter are spread or expanded laterally by applied clamping pressure. .Y l

Another improvement affordedvby the present invention consists in the provision of a U-shaped clamping bolt which is of rectangular cross section except vas regards the portions ofv the legs which are threaded to receive the clamping` nuts thereon'. This materially increases the area of effective frictional contact between the cable and 15 vention consists in providing the clamping platelwith similar opposing cable-engaging surfaces Illa In the drawing` thee` clamping.; plate,` the U -f .shaped clamping bolt, andthe clampingnutsof myjimproved r clamp: arev respectively indicated at bolt Bf is: square. inl cross sectionv rIhe clamping v except as regards fthe# leg portions :.@at' whichv` are passed .i througlrz lthe plate f openings:l 5a.; and are' v.threaded to receive the clamping nuts 'I thereon.

Plate 5 is provided with four cable-engaging lugs .designated 8,A 9, I0 and. I I. Lugs 8 and 9 are and Ilwhich arearranged at opposite sides of the remaining bolt opening 5a. Lugs and 9 are y 'provided with relativelylong, fiat, cable-engaging surfaces 8a and 9a which are normally parallel andIlaofthelugslllandIl.l f

Portions of the plate 5 in which the bolt openings 5a are rformed are thickened as indicated at jected to clamping pressure lbetween the bight portion of the bolt and the'central portion of the plate 5 when the nuts "I are tightened against the inclined surfaces 5c. When thus subjected tov clamping pressure the cable elements Aand B are I `deformed from thevcircular cross section shown y toga substantially oval cross section rand are thus expanded laterally,J against the cable-engaging the .clamping bolt and thereby improves the holding efficiency of the clamp.

A further improvement consists in forming the cable-engaging lugs'so that opposing lugs present relatively long cable-engaging surfaces which are normally parallel to each other as distinguished from conventional cable clamps in which opposing cable-engaging lugs are formedvvith` inclined `cable-engaging surfaces which converge toward surfaces 8a,.9`a, |011 and Ila of the `lugs 8, 9, IIJ and I I. v`If the clamping plate is made of malleable the pressure of the clamping nuts I against the inclined surfaces 5c has the eifect of applying bending or warping stresses to opposite marginal portions of the plate inqsuch manner that the' opposing cable-engaging' lugs of each pair are e urged toward each other in directr opposition to lthe cable pressure tending tovv separate said lugs. v This, alongwith the increased area of frictional Fig. 1 is a plan view of my improved cable clamp.`

Fig. 2 is a side view; and i v Fig. 1.

contact between the cable elements and the U'- bolt due tothe rectangular cross section of the latter, greatly increases the vholding eiciency of y,

the clamp yas compared'with conventional clamps creased by reason vof the fact thatopposing cabletively long, flat, cable-engaging surfaces which are normally parallel with each othery and are usually spaced apart a distance only slightly greater than the diameter of the cable or cable elements received therebetween. The length of the flat cable-engaging surfaces of each pair of cable-engaging lugs is preferably such that these surfaces extend from a point below the transverse centre of the lower cable elements shown in Fig.2 to a point above the transverse centre of the upper cable element shown in said figure.

Having thus described what I now conceive to be the preferred embodiment of my invention, it

claims, the terms upper and lower" are used in a relative sense as applied to the vertically disposed clamp assembly shown in Figs. 2 and 3.

I claim:

1. A cable clamp comprising a clamping plate y provided with spaced, diametrically opposite bolt holes, a U-shaped clamping bolt having the legs thereof passed downwardly through said bolt 4holes and equipped with clamping nuts positioned be.-

neath said plate and lugs extending upwardly from said plate at opposite sides of each leg of the clamping bolt, the portions of the plate in which the bolt openings are formed being provided with downwardly facing inclined surfaces against which the clamping nuts are tightened, the location and inclination of said surfaces being such that, when cable elements are clamped in place between the bight portion of the clamping bolt and the opposing portion of the clamping plate, the pressure of the clamping nuts against said inclined surfaces tends to urge opposing cable-engaging lugs toward each other and into tighter gripping' engagement with interposed portions of the cable elements.

2. A cable clamp as set forth in claim l, in which the U-bolt is of rectangular cross section except as regards portions of the legs which are threaded to receive the clamping nuts.

3. A cable clamp as set forth in claim l, in which opposing cable-engaging lugs lying 'at opposite sides of the portion of the plate which is opposed to the bight portion of the clamping bolt are provided with opposing, normally parallel, cablegripping surfaces. Y

, HERMAN J. ROLLAND. 

